O`toole, Barry J., author
Routledge, 2006
Buku Teks
Monck, Bosworth
Phoenix House Limited, 1952
Buku Teks
Blackstone Press Limited, 1993
Buku Teks
R. A. W. Rhodes [and others]
Open University press, 2003
Buku Teks
Ashton, Robert
Weidenfeld and Nicolson, 1979
Buku Teks